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Oshima Formation
- Coherent formation
- Middle - lower crust of a Paleozoic volcanic island arc (Yakuno paleo-island arc) in the ocean
- Permian
- Intruded by: Yakuno Complex
- Sedimentary facies: Marine
- Lithofacies: Shale
- Lithofacies (Minor): Sandstone, Greenstones, Conglomerate
- Basalt Shale Unit (Oshima, Fukui pref.)
- [ Upper ]
- ?--?--?--?--?-
- Oshima Formation
- ?--?--?--?--?-
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oshima - Motodorijima island - Kawamura - Cape Nokogirisaki, Oi city, Oi county, Fukui pref.
- Hirokawa and Kuroda (1957) Nokogirizaki, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 22p. (in Japanese with English abstract 9p.)